aFe Power's new engine oil pan brings performance engineering to the protection of your GM Silverado/Sierra HD with Duramax turbo diesel engines. This oil pan is constructed out of durable A356 cast aluminum with machined fins for maximum strength and styling. This cover incorporates a magnetic drain plug to capture loose particles for maximum engine protection. All necessary hardware is included for a hassle-free installation. Built-in External and Internal Fins: Built-in External and Internal fins transfer heat from the fluid to the outside air for maximum cooling. Magnetic Drain Plug: This system incorporates a magnetic drain plug that captures loose particles for maximum engine protection. When it comes to engineering for power, performance, protection and value, aFe Power is the only choice.